In the photoelectric effect,
which of the following photons will eject an electron with greatest kinetic energy ? red
photon green
photon violet
photon ultraviolet
photon If the frequency of a
monochromatic light beam is 1.2 x 1015 Hz, what is the energy of each of its
photons ? 6.6
x 10-34 J 6.6
x 10-19 J 7.9
x 10-19 J 7.9
x 10-20 J As the frequency of a photon
increases, the energy of the photon
decreases increases
remains
the same The threshold frequency of a
metal surface is in the violet light region. What type of radiation will cause electrons to be emitted from the metal's
surface ? infrared
red
light ultraviolet
radio In the photoelectric effect, if
only the frequency of the incident light is increased, the rate of electron emission will decrease
increase
remain
the same In the photoelectric effect, if
only the intensity of the incident light is increased, the energy of each ejected electron
will decrease
increase
remain
the same
6. In the photoelectric effect,
which of the following photons will eject an electron with greatest kinetic energy ?
red
photon green
photon violet
photon ultraviolet
photon
7. In the photoelectric effect,
the speed of emitted electrons may be increased by
increasing
the frequency of the light decreasing
the frequency of the light
increasing
the intensity of illumination decreasing
the intensity of illumination
8. Which phenomenon is best
explained by the particle nature of light ?
interference
the
Doppler effect polarization the
photoelectric effect
9. The threshold frequency for
a photoemissive surface is 6.4 x 1014 Hz. Which color light, if incident upon
the
surface, may produce
photoelectrons ?
blue
green
yellow red
10. As the wavelength of a
photon decreases, its momentum
decreases increases
remains the same
11. As the energy of a photon
increases, its momentum
decreases increases
remains the same
12. In a collision
between an x-ray photon and an electron, which of the following is conserved ?
energy momentum
energy and momentum
13. What is an alpha particle ?
a proton a helium nucleus an electron a photon
14. Rutherford's model of the atom
showed that most of the volume of the atom is composed of
protons
electrons
neutrons empty
space
15. What is the minimum energy
needed to ionize a hydrogen atom when it is in the n = 2 state ?
1.9 eV
3.4 eV 12.2
eV 13.6 eV
16. Alpha particles fired at
thin metal foil are scattered in hyperbolic paths due to the
attraction
between electrons and alpha particles magnetic repulsion between electrons and alpha
particles
gravitational attraction between nuclei and
alpha particles repulsive forces between
nuclei and alpha particles
17. A photon emitted from an
excited hydrogen atom has an energy of 3.02 eV. Which electron energy-level transition
would produce this photon ?
n = 1
to n = 6 n = 2
to n = 6 n = 6 to n = 1 n = 6 to n = 2
18. As the momentum of an
electron increases, the electron's wavelength
decreases increases remains the same
19. An electron in a mercury
atom that is changing from the "d" to the "a" level emits a photon
with an energy of
4.95 eV 10.38 eV 15.33 eV 5.43
eV
20. Compared to the amount of
energy required to excite an atom, the amount of energy released by the atom
when it returns to the ground
state is
less greater the same
21. According to the Rutherford
model of the atom, an atomic nucleus contains
all of
the atom's electric charge, but no mass all of the atom's mass, but no electric charge
most of the atom's mass and all of its negative
charge most of the atom's mass and all of its positive
charge
22.What is the wavelength of
the matter wave associated with a baseball of 0.25 kg mass moving at 40. m/s ?
6.6 x 1034 m 6.6 x 10-35 m 3.3 x 10-34 m 8.6 x 10-34 m
23. A hydrogen atom in the
ground state receives 10.2 eV of energy. To which energy level may the atom
become excited ?
n = 5 n = 2 n = 3 n = 4
24. Which type of force causes
the hyperbolic trajectory of alpha partcles in Rutherford's scattering experiment ?
gravitational electrostatic magnetic nuclear
25. Which phenomenon provides
evidence that atoms have discrete energy levels ?
radioactive decay alpha-particle scattering photoelectric effect emission spectra